Ultra-modern top hinge design. Fully multi-coated optics to produce sharp images, Focus knob with 2 turns close focus from 6.6ft/2m. High resolution phase corrected BAK-4 roof prisms. Lightweight and durable rubber coated mid-size chassis. Stay-on lens covers for maximum lens protection. Twist-up eye cups with position stops for eye relief. Waterproof, fog proof and nitrogen purged.